Use this skill when applying VCSDD to Python projects. Provides hypothesis property testing patterns, mutmut mutation testing, and pytest integration for the VCSDD pipeline.
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See how to installReview the instructions the agent will receive before you install.
| Tier | Tool | Install | Use Case |
|---|---|---|---|
| 1 | hypothesis | pip install hypothesis | Property-based testing |
| 1 | mutmut | pip install mutmut | Mutation testing |
| 1 | pytest-cov | pip install pytest-cov | Coverage reporting |
from hypothesis import given, settings, strategies as st
from hypothesis import HealthCheck
@given(st.text(min_size=0, max_size=1000))
@settings(max_examples=500, suppress_health_check=[HealthCheck.too_slow])
def test_parse_never_raises_on_arbitrary_input(s: str):
"""Parse should never panic - it should return a Result."""
try:
result = parse(s)
# If successful, roundtrip should hold
if result is not None:
assert serialize(result) == s
except ParseError:
pass # Expected error types are ok
@given(st.from_regex(r'[a-z]{1,20}'))
def test_parse_valid_input(s: str):
result = parse(s)
assert result is not None
assert serialize(result) == s
# Run mutation testing
mutmut run --paths-to-mutate src/
# Check results
mutmut results
mutmut show <mutation_id> # See specific mutations
# Generate HTML report
mutmut html
# Run tests and capture output
pytest tests/ -v 2>&1 | tee .vcsdd/features/<name>/evidence/sprint-1-red-phase.log
# Verify failure
grep -q "FAILED" .vcsdd/features/<name>/evidence/sprint-1-red-phase.log
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Use this skill when running or interpreting VCSDD adversarial reviews. Provides calibration guidance for the Adversary agent, finding severity classification, and anti-leniency enforcement patterns.
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Run Phase 3 (adversarial review) for the active VCSDD feature. Spawns a fresh vcsdd-adversary agent with zero Builder context to review implementation against spec. Produces binary PASS/FAIL verdict per dimension.
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Create a git commit for the current VCSDD phase. Auto-generates a conventional commit message from state.json including phase, sprint, gate verdict, and affected bead IDs. Tags with vcsdd/<feature>/phase-<id>.
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Run the strict-mode sprint contract review after Phase 2c. Spawns a fresh vcsdd-adversary instance to review `contracts/sprint-N.md` and writes a PASS/FAIL verdict under `reviews/contracts/sprint-N/output/`.
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Run Phase 6 (convergence check) for the active VCSDD feature. Validates four-dimensional convergence: finding diminishment, finding specificity, criteria coverage, and duplicate detection.
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Use this skill during Phase 6 convergence checks. Provides four-dimensional convergence analysis, hallucination detection, and duplicate finding identification.
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